A B757-200 FLT CREW EXPERIENCED LOSS OF OIL PRESSURE ON TKOF. THEY DECLARED AN EMER AND RETURNED TO LAND OVERWT AT DEP ARPT; STRIKING 2 BIRDS IN THE LNDG FLARE.

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FO WAS FLYING THE LEG FROM ZZZ TO ZZZ1. AFTER THE FLAPS WERE RETRACTED AND WE WERE GIVEN A HDG OFF THE SID; AT ABOUT 5000 FT; HE BROUGHT TO MY ATTN THAT THE OIL PRESSURE ON THE #1 ENG WAS ZERO AND WAS HIGHLIGHTED IN RED. I DECLARED AN EMER WITH DEP CTL AND TOLD THEM WE WOULD BE RETURNING TO ZZZ FOR AN IMMEDIATE LNDG. AS PER THE PREFLT BRIEFING; THE FO FLEW THE ACFT AND HANDLED THE ATC RADIOS. I REFERRED TO THE QRH; SHUT DOWN THE L ENG AS DIRECTED; BRIEFED THE FLT ATTENDANTS; MADE A PA TO THE PAX; CONTACTED DISPATCH; THEN FOLLOWED THROUGH WITH THE MECHANICAL CHKLIST. I SPOKE WITH THE ARFF CHIEF ON THE DISCRETE RADIO FREQ AND TOLD HIM THAT WE PLANNED ON STOPPING THE ACFT AND HAVING THEM LOOK US OVER; AFTER LNDG. WE ALSO STRUCK 2 BIRDS IN THE FLARE. THIS WAS RPTED TO THE TWR; WHO HAD AIRFIELD MGMNT SEARCH THE RWY. THEY FOLLOWED US TO THE GATE AND TOLD ME THAT THEY HAD FOUND 2 DOVES ON THE RWY. WE LANDED AT 202000 LBS; WHICH WAS 4000 LBS OVER MAX LNDG WT. THE TOUCHDOWN RATE WAS 100 FPM AND VERY SMOOTH. AFTER LNDG WE STOPPED THE ACFT AND THE ARFF CREW INSPECTED THE ACFT AND FOUND NO VISIBLE ABNORMALITIES. WE RECEIVED CLRNC TO TAXI TO GATE AND WERE FOLLOWED BY THE ARFF CREW AND AIRFIELD MGMNT. AFTER ARRIVING AT THE GATE; A MAINT SUPVR MET THE ACFT. THE OIL QUANTITY READ 18 QUARTS IN THE L ENG; WHICH MAY INDICATE A FAILURE OF A PUMP OR XMITTER; RATHER THAN A BUSTED LINE. I CALLED DISPATCH ON THE RADIO AND ANSWERED ALL OF HIS QUESTIONS; THEN FILLED OUT THE LOGBOOK; WITH 3 ENTRIES; LOSS OF OIL PRESSURE IN THE L ENG; OVERWT LNDG; AND BIRD STRIKE.